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2,4
Three results are missing for a(7) in Eric Weisstein's World of Mathematics, they're [2, 3, 7, 43, 3263, 4051, 2558951] [2, 3, 11, 25, 29, 1097, 2753] [2, 3, 13, 25, 29, 67, 2981] [From Du, Zhao Hui, Jan 24 2010]
Table of n, a(n) for n=2..8.
Eric Weisstein's World of Mathematics, Znam's Problem
all results for a(8) [From Du, Zhao Hui, Jan 24 2010]
Cf. A075461.
Sequence in context: A217389 A123310 A058119 * A187008 A075634 A007127
Adjacent sequences: A075438 A075439 A075440 * A075442 A075443 A075444
nonn,more,hard
Eric W. Weisstein, Sep 16, 2002
Corrected a(7)-a(8) by Du, Zhao Hui, Jan 24 2010
approved